Risorse minerarie degli Stati Uniti . 3,8482,778,482 Menomineerange. Tonnellate lunghe. 10,375 78,028 245, 672 524, 735 726, 671, 1.136, 018 1, 047,863 895 634 690,435 880, 006 1,199,343 1.191 unità, 097 1, 876,157 2, 274,1921,856,124 Gogebicrange. Tonnellate lunghe. 1,022119,590.756, 2371, 285, 2651,433,6892,147, 9232,914,0812,041,754 Vermilionrange. Tonnellate lunghe. 62,122227,075307, 948394, 910511, 953864,508891,910945,105 NewJersey. Lunga600,665,525,390,285,315,409,488,745,737,932,521,393,330,500,547,447,415,495,525 tonnellate.000000.,000,000,000,000,674,028,000,052,762,416,710,000,501,889,738,510,808.612 Cornwall,Pa. Lo

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Mineral resources of the United States . 3, 8482, 778, 482 Menomineerange. Long tons. 10, 375 78, 028 245, 672 524, 735 726, 671 1, 136, 018 1, 047, 863 895, 634 690, 435 880, 006 1, 199, 343 1, 191, 097 1, 876, 157 2, 274, 1921, 856, 124 Gogebicrange. Long tons. 1, 022119, 590.756, 2371, 285, 2651, 433, 6892, 147, 9232, 914, 0812, 041, 754 Vermilionrange. Long tons. 62, 122227, 075307, 948394, 910511, 953864, 508891, 910945, 105 NewJersey. Long600, 665, 525, 390, 285, 315, 409, 488, 745, 737, 932, 521, 393, 330, 500, 547, 447, 415, 495, 525 tons.000000., 000, 000, 000, 000, 674, 028, 000, 052, 762, 416, 710, 000, 501, 889, 738, 510, 808.612 Cornwall, Pa. Long tons.193, 317166, 782112, 42998, 925137, 902171, 589179, 299268, 488231, 173249, 050309, 681363, 144412, 320508, 864688, 054667, 210722, 917769, 020686, 302663, 746 Years. 18721873187418751876187718781879188018811882188318841885188618871888188918901891 Lake Cham-plain, N. T. Long tons.350, 000420, 000250, 000300, 000290, 000365, 000380, 000480, 000700, 000637, 000725, 000540, 000530, 000420, 000588, 829768, 852669, 553779, 900821. 994554, 865 Missouri Alabama.. Importations. Long tons. 27, 000 62, 000 69, 000 83, 000 26, 000 42, 000 29, 765 284, 141 493, 408 782, 887 589, 655 490, 875 487, 820 390, 786 1, 039, 433 1, 194, 301 .>87, 470 853, 573 1, 246, 830 912, 864 42 MINEEAL RESOURCES. IRON-ORE CONCENTRATION. Strictly speaking, the concentration of iron ores would refer to anyprocess or method by which the percentage of iron in the ore is im-proved by the removal of gangue materials. If it were taken in thisbroad sense it would include washing of brown hematite ores to re-move the ochre and clay and the system of hand sorting or cobbing em-ployed at some of the red hematite mines of the Lake Superior region. The term concentrates, however, is more generally applied to orewhich iias been comminuted by means of crushing machinery and thenpassed through water-jigs or magnetic separators to remove materialswhich lower the grade of the ore. In jigging, the crushed ore is agitated, water being introduced whichremove

Parole chiave associate all'immagine

• bookcentury1800
• booksubjectmineralindustries
• booksubjectminesa